﻿using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace MTFramework.Utils
{
    /// <summary>
    /// 文件哈希值校验码工具
    /// </summary>
    public static class FileHash
    {
        /// <summary>
        /// 获取文件MD5校验码
        /// </summary>
        /// <param name="filePath">文件路径</param>
        /// <returns></returns>
        public static string GetFileMD5Hash(string filePath)
        {
            return getFileHashCode(filePath, HashType.MD5);
        }
        /// <summary>
        /// 比较文件MD5校验码
        /// </summary>
        /// <param name="md5str">原文件的校验码</param>
        /// <param name="filePath">文件路径</param>
        /// <returns></returns>
        public static bool FileMD5HashCalibration(string md5str, string filePath)
        {
            return md5str.ToUpper().Equals(GetFileMD5Hash(filePath));
        }

        /// <summary>
        /// 获取文件的SHA1校验码
        /// </summary>
        /// <param name="filePath">文件路径</param>
        /// <returns></returns>
        public static string GetFileSHA1Hash(string filePath)
        {
            return getFileHashCode(filePath, HashType.SHA1);
        }

        /// <summary>
        /// 比较文件SHA1校验码
        /// </summary>
        /// <param name="sha1str">原文件的SHA1的校验码</param>
        /// <param name="filePath">文件路径</param>
        /// <returns></returns>
        public static bool FileSHA1HashCalibration(string sha1str, string filePath)
        {
            return sha1str.ToUpper().Equals(GetFileSHA1Hash(filePath));
        }


        /// <summary>
        /// 获取文件的SHA256校验码
        /// </summary>
        /// <param name="filePath">文件路径</param>
        /// <returns></returns>
        public static string GetFileSHA256Hash(string filePath)
        {
            return getFileHashCode(filePath, HashType.SHA256);
        }

        /// <summary>
        /// 比较文件SHA256校验码
        /// </summary>
        /// <param name="sha256str">原文件的SHA256的校验码</param>
        /// <param name="filePath">文件路径</param>
        /// <returns></returns>
        public static bool FileSHA256HashCalibration(string sha256str, string filePath)
        {
            return sha256str.ToUpper().Equals(GetFileSHA256Hash(filePath));
        }


        /// <summary>
        /// 获取文件的SHA384校验码
        /// </summary>
        /// <param name="filePath">文件路径</param>
        /// <returns></returns>
        public static string GetFileSHA384Hash(string filePath)
        {
            return getFileHashCode(filePath, HashType.SHA384);
        }

        /// <summary>
        /// 比较文件SHA384校验码
        /// </summary>
        /// <param name="sha256str">原文件的SHA384的校验码</param>
        /// <param name="filePath">文件路径</param>
        /// <returns></returns>
        public static bool FileSHA384HashCalibration(string sha384str, string filePath)
        {
            return sha384str.ToUpper().Equals(GetFileSHA384Hash(filePath));
        }

        /// <summary>
        /// 获取文件的SHA512校验码
        /// </summary>
        /// <param name="filePath">文件路径</param>
        /// <returns></returns>
        public static string GetFileSHA512Hash(string filePath)
        {
            return getFileHashCode(filePath, HashType.SHA512);
        }

        /// <summary>
        /// 比较文件SHA512校验码
        /// </summary>
        /// <param name="sha256str">原文件的SHA512的校验码</param>
        /// <param name="filePath">文件路径</param>
        /// <returns></returns>
        public static bool FileSHA512HashCalibration(string sha512str, string filePath)
        {
            return sha512str.ToUpper().Equals(GetFileSHA512Hash(filePath));
        }

        /// <summary>
        /// 获取文件的CRC16校验码
        /// </summary>
        /// <param name="filePath">文件路径</param>
        /// <returns></returns>
        public static string GetFileCRC16Hash(string filePath)
        {
            return getFileHashCode(filePath, HashType.CRC16);
        }

        /// <summary>
        /// 比较文件CRC16校验码
        /// </summary>
        /// <param name="sha256str">原文件的CRC16的校验码</param>
        /// <param name="filePath">文件路径</param>
        /// <returns></returns>
        public static bool FileCRC16HashCalibration(string crc16str, string filePath)
        {
            return crc16str.ToUpper().Equals(GetFileCRC16Hash(filePath));
        }


        /// <summary>
        /// 获取文件的CRC32校验码
        /// </summary>
        /// <param name="filePath">文件路径</param>
        /// <returns></returns>
        public static string GetFileCRC32Hash(string filePath)
        {
            return getFileHashCode(filePath, HashType.CRC32);
        }

        /// <summary>
        /// 比较文件CRC32校验码
        /// </summary>
        /// <param name="sha256str">原文件的CRC32的校验码</param>
        /// <param name="filePath">文件路径</param>
        /// <returns></returns>
        public static bool FileCRC32HashCalibration(string crc32str, string filePath)
        {
            return crc32str.ToUpper().Equals(GetFileCRC32Hash(filePath));
        }

        /// <summary>
        /// 获取文件校验码
        /// </summary>
        /// <param name="filePath">文件路径</param>
        /// <param name="type">校验码类型</param>
        /// <returns></returns>
        private static string getFileHashCode(string filePath, HashType type)
        {
            string result = string.Empty;
            System.Security.Cryptography.HashAlgorithm algorithm = null;

            switch (type)
            {
                case HashType.MD5:
                    algorithm = System.Security.Cryptography.MD5.Create();
                    break;
                case HashType.SHA1:
                    algorithm = System.Security.Cryptography.SHA1.Create();
                    break;
                case HashType.SHA256:
                    algorithm = System.Security.Cryptography.SHA256.Create();
                    break;
                case HashType.SHA384:
                    algorithm = System.Security.Cryptography.SHA384.Create();
                    break;
                case HashType.SHA512:
                    algorithm = System.Security.Cryptography.HMACSHA512.Create();
                    break;
                case HashType.CRC16:
                    using (FileStream stream = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.Read, 8192))
                    {
                        byte[] buf = new byte[1024 * 1024];
                        int readLen = stream.Read(buf, 0, buf.Length);
                        return getCRC16(buf, 0, readLen);
                    }
                case HashType.CRC32:
                    using (FileStream stream = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.Read, 8192))
                    {
                        byte[] buf = new byte[1024 * 1024];
                        int readLen = stream.Read(buf, 0, buf.Length);
                        return getCRC32(buf, 0, readLen).ToString("X").ToUpper();
                    }
                default:
                    break;
            }

            if (algorithm == null)
            {
                return result;
            }
            using (FileStream stream = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.Read, 8192))
            {
                byte[] hash = algorithm.ComputeHash(stream);

                result = BitConverter.ToString(hash).Replace("-", "");
            }
            return result.ToUpper();
        }
        /// <summary>
        /// CRC32表
        /// </summary>
        private static UInt32[] crc32Table = {
                                                 0x0,        0x77073096, 0xEE0E612C, 0x990951BA, 0x76DC419,  0x706AF48F,
                                                 0xE963A535, 0x9E6495A3, 0xEDB8832,  0x79DCB8A4, 0xE0D5E91E, 0x97D2D988,
                                                 0x9B64C2B,  0x7EB17CBD, 0xE7B82D07, 0x90BF1D91, 0x1DB71064, 0x6AB020F2,
                                                 0xF3B97148, 0x84BE41DE, 0x1ADAD47D, 0x6DDDE4EB, 0xF4D4B551, 0x83D385C7,
                                                 0x136C9856, 0x646BA8C0, 0xFD62F97A, 0x8A65C9EC, 0x14015C4F, 0x63066CD9,
                                                 0xFA0F3D63, 0x8D080DF5, 0x3B6E20C8, 0x4C69105E, 0xD56041E4, 0xA2677172,
                                                 0x3C03E4D1, 0x4B04D447, 0xD20D85FD, 0xA50AB56B, 0x35B5A8FA, 0x42B2986C,
                                                 0xDBBBC9D6, 0xACBCF940, 0x32D86CE3, 0x45DF5C75, 0xDCD60DCF, 0xABD13D59,
                                                 0x26D930AC, 0x51DE003A, 0xC8D75180, 0xBFD06116, 0x21B4F4B5, 0x56B3C423,
                                                 0xCFBA9599, 0xB8BDA50F, 0x2802B89E, 0x5F058808, 0xC60CD9B2, 0xB10BE924,
                                                 0x2F6F7C87, 0x58684C11, 0xC1611DAB, 0xB6662D3D, 0x76DC4190, 0x1DB7106, 
                                                 0x98D220BC, 0xEFD5102A, 0x71B18589, 0x6B6B51F,  0x9FBFE4A5, 0xE8B8D433,  
                                                 0x7807C9A2, 0xF00F934,  0x9609A88E, 0xE10E9818, 0x7F6A0DBB, 0x86D3D2D, 
                                                 0x91646C97, 0xE6635C01, 0x6B6B51F4, 0x1C6C6162, 0x856530D8, 0xF262004E, 
                                                 0x6C0695ED, 0x1B01A57B, 0x8208F4C1, 0xF50FC457, 0x65B0D9C6, 0x12B7E950, 
                                                 0x8BBEB8EA, 0xFCB9887C, 0x62DD1DDF, 0x15DA2D49, 0x8CD37CF3, 0xFBD44C65,
                                                 0x4DB26158, 0x3AB551CE, 0xA3BC0074, 0xD4BB30E2, 0x4ADFA541, 0x3DD895D7, 
                                                 0xA4D1C46D, 0xD3D6F4FB, 0x4369E96A, 0x346ED9FC, 0xAD678846, 0xDA60B8D0,
                                                 0x44042D73, 0x33031DE5, 0xAA0A4C5F, 0xDD0D7CC9, 0x5005713C, 0x270241AA, 
                                                 0xBE0B1010, 0xC90C2086, 0x5768B525, 0x206F85B3, 0xB966D409, 0xCE61E49F,   
                                                 0x5EDEF90E, 0x29D9C998, 0xB0D09822, 0xC7D7A8B4, 0x59B33D17, 0x2EB40D81, 
                                                 0xB7BD5C3B, 0xC0BA6CAD, 0xEDB88320, 0x9ABFB3B6, 0x3B6E20C,  0x74B1D29A, 
                                                 0xEAD54739, 0x9DD277AF, 0x4DB2615,  0x73DC1683, 0xE3630B12, 0x94643B84, 
                                                 0xD6D6A3E,  0x7A6A5AA8, 0xE40ECF0B, 0x9309FF9D, 0xA00AE27,  0x7D079EB1,
                                                 0xF00F9344, 0x8708A3D2, 0x1E01F268, 0x6906C2FE, 0xF762575D, 0x806567CB,
                                                 0x196C3671, 0x6E6B06E7, 0xFED41B76, 0x89D32BE0, 0x10DA7A5A, 0x67DD4ACC, 
                                                 0xF9B9DF6F, 0x8EBEEFF9, 0x17B7BE43, 0x60B08ED5, 0xD6D6A3E8, 0xA1D1937E, 
                                                 0x38D8C2C4, 0x4FDFF252, 0xD1BB67F1, 0xA6BC5767, 0x3FB506DD, 0x48B2364B,   
                                                 0xD80D2BDA, 0xAF0A1B4C, 0x36034AF6, 0x41047A60, 0xDF60EFC3, 0xA867DF55, 
                                                 0x316E8EEF, 0x4669BE79, 0xCB61B38C, 0xBC66831A, 0x256FD2A0, 0x5268E236, 
                                                 0xCC0C7795, 0xBB0B4703, 0x220216B9, 0x5505262F, 0xC5BA3BBE, 0xB2BD0B28, 
                                                 0x2BB45A92, 0x5CB36A04, 0xC2D7FFA7, 0xB5D0CF31, 0x2CD99E8B, 0x5BDEAE1D,
                                                 0x9B64C2B0, 0xEC63F226, 0x756AA39C, 0x26D930A,  0x9C0906A9, 0xEB0E363F, 
                                                 0x72076785, 0x5005713,  0x95BF4A82, 0xE2B87A14, 0x7BB12BAE, 0xCB61B38, 
                                                 0x92D28E9B, 0xE5D5BE0D, 0x7CDCEFB7, 0xBDBDF21,  0x86D3D2D4, 0xF1D4E242, 
                                                 0x68DDB3F8, 0x1FDA836E, 0x81BE16CD, 0xF6B9265B, 0x6FB077E1, 0x18B74777,
                                                 0x88085AE6, 0xFF0F6A70, 0x66063BCA, 0x11010B5C, 0x8F659EFF, 0xF862AE69,
                                                 0x616BFFD3, 0x166CCF45, 0xA00AE278, 0xD70DD2EE, 0x4E048354, 0x3903B3C2,
                                                 0xA7672661, 0xD06016F7, 0x4969474D, 0x3E6E77DB, 0xAED16A4A, 0xD9D65ADC,
                                                 0x40DF0B66, 0x37D83BF0, 0xA9BCAE53, 0xDEBB9EC5, 0x47B2CF7F, 0x30B5FFE9,
                                                 0xBDBDF21C, 0xCABAC28A, 0x53B39330, 0x24B4A3A6, 0xBAD03605, 0xCDD70693,
                                                 0x54DE5729, 0x23D967BF, 0xB3667A2E, 0xC4614AB8, 0x5D681B02, 0x2A6F2B94, 
                                                 0xB40BBE37, 0xC30C8EA1, 0x5A05DF1B, 0x2D02EF8D
                                             };
        /// <summary>
        /// 计算CRC32值
        /// </summary>
        /// <param name="bytes">数据源</param>
        /// <param name="index">起始位置</param>
        /// <param name="length">长度</param>
        /// <returns></returns>
        private static int getCRC32(byte[] bytes, int index, int length)
        {
            int iCount = length > bytes.Length ? bytes.Length : length;
            UInt32 crcb = 0xFFFFFFFF;
            for (int i = 0; i < iCount; i++)
            {
                crcb = ((crcb >> 8) & 0x00FFFFFF) ^ crc32Table[(crcb ^ bytes[i]) & 0xFF];
            }
            return (int)(crcb ^ 0xFFFFFFFF);
        }

        /// <summary>
        /// CRC16表
        /// </summary>
        private static ushort[] crc16tab ={
                                              0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50A5, 0x60C6, 0x70E7,
                                              0x8108, 0x9129, 0xA14A, 0xB16B, 0xC18C, 0xD1AD, 0xE1CE, 0xF1EF,
                                              0x1231, 0x0210, 0x3273, 0x2252, 0x52B5, 0x4294, 0x72F7, 0x62D6,
                                              0x9339, 0x8318, 0xB37B, 0xA35A, 0xD3BD, 0xC39C, 0xF3FF, 0xE3DE,
                                              0x2462, 0x3443, 0x0420, 0x1401, 0x64E6, 0x74C7, 0x44A4, 0x5485,
                                              0xA56A, 0xB54B, 0x8528, 0x9509, 0xE5EE, 0xF5CF, 0xC5AC, 0xD58D,
                                              0x3653, 0x2672, 0x1611, 0x0630, 0x76D7, 0x66F6, 0x5695, 0x46B4,
                                              0xB75B, 0xA77A, 0x9719, 0x8738, 0xF7DF, 0xE7FE, 0xD79D, 0xC7BC,
                                              0x48C4, 0x58E5, 0x6886, 0x78A7, 0x0840, 0x1861, 0x2802, 0x3823,
                                              0xC9CC, 0xD9ED, 0xE98E, 0xF9AF, 0x8948, 0x9969, 0xA90A, 0xB92B,
                                              0x5AF5, 0x4AD4, 0x7AB7, 0x6A96, 0x1A71, 0x0A50, 0x3A33, 0x2A12,
                                              0xDBFD, 0xCBDC, 0xFBBF, 0xEB9E, 0x9B79, 0x8B58, 0xBB3B, 0xAB1A,
                                              0x6CA6, 0x7C87, 0x4CE4, 0x5CC5, 0x2C22, 0x3C03, 0x0C60, 0x1C41,
                                              0xEDAE, 0xFD8F, 0xCDEC, 0xDDCD, 0xAD2A, 0xBD0B, 0x8D68, 0x9D49,
                                              0x7E97, 0x6EB6, 0x5ED5, 0x4EF4, 0x3E13, 0x2E32, 0x1E51, 0x0E70,
                                              0xFF9F, 0xEFBE, 0xDFDD, 0xCFFC, 0xBF1B, 0xAF3A, 0x9F59, 0x8F78,
                                              0x9188, 0x81A9, 0xB1CA, 0xA1EB, 0xD10C, 0xC12D, 0xF14E, 0xE16F,
                                              0x1080, 0x00A1, 0x30C2, 0x20E3, 0x5004, 0x4025, 0x7046, 0x6067,
                                              0x83B9, 0x9398, 0xA3FB, 0xB3DA, 0xC33D, 0xD31C, 0xE37F, 0xF35E,
                                              0x02B1, 0x1290, 0x22F3, 0x32D2, 0x4235, 0x5214, 0x6277, 0x7256,
                                              0xB5EA, 0xA5CB, 0x95A8, 0x8589, 0xF56E, 0xE54F, 0xD52C, 0xC50D,
                                              0x34E2, 0x24C3, 0x14A0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405,
                                              0xA7DB, 0xB7FA, 0x8799, 0x97B8, 0xE75F, 0xF77E, 0xC71D, 0xD73C,
                                              0x26D3, 0x36F2, 0x0691, 0x16B0, 0x6657, 0x7676, 0x4615, 0x5634,
                                              0xD94C, 0xC96D, 0xF90E, 0xE92F, 0x99C8, 0x89E9, 0xB98A, 0xA9AB,
                                              0x5844, 0x4865, 0x7806, 0x6827, 0x18C0, 0x08E1, 0x3882, 0x28A3,
                                              0xCB7D, 0xDB5C, 0xEB3F, 0xFB1E, 0x8BF9, 0x9BD8, 0xABBB, 0xBB9A,
                                              0x4A75, 0x5A54, 0x6A37, 0x7A16, 0x0AF1, 0x1AD0, 0x2AB3, 0x3A92,
                                              0xFD2E, 0xED0F, 0xDD6C, 0xCD4D, 0xBDAA, 0xAD8B, 0x9DE8, 0x8DC9,
                                              0x7C26, 0x6C07, 0x5C64, 0x4C45, 0x3CA2, 0x2C83, 0x1CE0, 0x0CC1,
                                              0xEF1F, 0xFF3E, 0xCF5D, 0xDF7C, 0xAF9B, 0xBFBA, 0x8FD9, 0x9FF8,
                                              0x6E17, 0x7E36, 0x4E55, 0x5E74, 0x2E93, 0x3EB2, 0x0ED1, 0x1EF0
                                          };

        /// <summary>
        /// CRC校验公式
        /// </summary>
        /// <param name="crc">CRC</param>
        /// <param name="cp">发送的数据序列</param>
        /// <returns>新CRC</returns>
        private static ushort xcrc(ushort crc, byte cp)
        {
            ushort t1 = 0, t2 = 0, t3 = 0, t4 = 0, t5 = 0, t6 = 0;
            t1 = (ushort)(crc >> 8);
            t2 = (ushort)(t1 & 0xff);
            t3 = (ushort)(cp & 0xff);
            t4 = (ushort)(crc << 8);
            t5 = (ushort)(t2 ^ t3);
            t6 = (ushort)(crc16tab[t5] ^ t4);
            return t6;
        }

        /// <summary>
        /// 获取CRC16校验码
        /// </summary>
        /// <param name="bufin">信息串</param>
        /// <param name="n">不包括校验字的串总长度</param>
        private static string getCRC16(byte[] bufin, int index, int length)
        {
            ushort crc16 = 0;
           // byte i;
            //n个数据的CRC校验
            for (index = 0; index < length; index++)
            {
                crc16 = xcrc(crc16, bufin[index]);
            }
            byte[] crc16buf = new byte[2];
            crc16buf[0] = (byte)(crc16 >> 8);
            crc16buf[1] = (byte)(crc16 & 0xff);

            return BitConverter.ToString(crc16buf).Replace("-", "").ToUpper();

        }


        enum HashType
        {
            MD5,
            SHA1,
            SHA256,
            SHA384,
            SHA512,
            CRC16,
            CRC32

        }

    }
}
